[FIX] base: missing flush() before setting up registry
[FIX] base: missing flush() before setting up registry

Custom models and fields set up the registry as part of their CRUD.
Make sure to flush() before setting up the registry, in order to avoid
neverending recomputations (as fixed by the former commit).

closes odoo/odoo#45163

X-original-commit: af6dbb5c7c165dcf37bf87ee76c0170795ecb574
Signed-off-by: Xavier Dollé (xdo) <a1a56fd5af677733fcc9fce69c49c5e66d550efa@odoo.com>

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